The 1769-2WS is a high-precision weighing interface designed for the Allen-Bradley Compact I/O platform. It provides direct connectivity between strain gauge-based load cells and CompactLogix or MicroLogix 1500 controllers. By eliminating the need for external weight transmitters, the 1769-2WS reduces system complexity and improves data throughput via the backplane.
The module supports two independent channels, each capable of excitation and signal conditioning for up to four 350-ohm load cells. This dual-channel architecture allows for synchronized weighing of two separate vessels or the summation of multiple sensors in a single large-scale application. The 1769-2WS is engineered for high-noise industrial environments, featuring robust electrical isolation to maintain signal stability and measurement accuracy.
Module Type: Dual-Channel Weigh Scale Interface
Compatibility: CompactLogix, MicroLogix 1500, 1769-AENTR
Excitation Voltage: 5 VDC ±1% (Regulated)
Load Cell Support: Up to eight 350-ohm sensors (4 per channel)
Measurement Resolution: 1 part in 10,000 (standard); 24-bit internal ADC
Sample Rate: User-selectable from 10 to 250 samples per second
Isolation: 1500 VDC (Channel-to-Channel and Channel-to-Backplane)
Backplane Current Draw: 5.1 VDC at 2.0 A (Maximum load)
Operating Temperature: –40 °C to +70 °C (–40 °F to +158 °F)
Input Signal Range: -0.5 mV/V to +3.5 mV/V
Calibration: Software-based (Zero, Span, and Tare via PLC logic)
Mounting: 35mm DIN-rail or Panel Mount
Batching & Blending: Precise ingredient measurement for chemical and food processing.
Vessel Weighing: Monitoring inventory levels in tanks, silos, and hoppers.
Tension Control: Measuring web tension in paper or plastic film manufacturing.
Checkweighing: Real-time weight verification on high-speed conveyor lines.
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